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ffmpeg / libavformat / thp.c @ e19fbbec

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/*
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 * THP Demuxer
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 * Copyright (c) 2007 Marco Gerards.
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "avformat.h"
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#include "allformats.h"
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typedef struct ThpDemuxContext {
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    int              version;
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    int              first_frame;
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    int              first_framesz;
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    int              last_frame;
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    int              compoff;
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    int              framecnt;
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    AVRational       fps;
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    int              frame;
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    int              next_frame;
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    int              next_framesz;
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    int              video_stream_index;
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    int              compcount;
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    unsigned char    components[16];
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    AVStream*        vst;
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    int              has_audio;
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} ThpDemuxContext;
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static int thp_probe(AVProbeData *p)
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{
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    /* check file header */
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    if (p->buf_size < 4)
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        return 0;
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    if (AV_RL32(p->buf) == MKTAG('T', 'H', 'P', '\0'))
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        return AVPROBE_SCORE_MAX;
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    else
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        return 0;
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}
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static int thp_read_header(AVFormatContext *s,
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                           AVFormatParameters *ap)
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{
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  ThpDemuxContext *thp = s->priv_data;
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  AVStream *st;
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  ByteIOContext *pb = &s->pb;
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  int i;
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  /* Read the file header.  */
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                         get_be32(pb); /* Skip Magic.  */
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  thp->version         = get_be32(pb);
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                         get_be32(pb); /* Max buf size.  */
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                         get_be32(pb); /* Max samples.  */
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  thp->fps             = av_d2q(av_int2flt(get_be32(pb)), INT_MAX);
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  thp->framecnt        = get_be32(pb);
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  thp->first_framesz   = get_be32(pb);
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                         get_be32(pb); /* Data size.  */
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  thp->compoff         = get_be32(pb);
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                         get_be32(pb); /* offsetDataOffset.  */
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  thp->first_frame     = get_be32(pb);
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  thp->last_frame      = get_be32(pb);
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  thp->next_framesz    = thp->first_framesz;
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  thp->next_frame      = thp->first_frame;
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  /* Read the component structure.  */
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  url_fseek (pb, thp->compoff, SEEK_SET);
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  thp->compcount       = get_be32(pb);
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  /* Read the list of component types.  */
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  get_buffer(pb, thp->components, 16);
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  for (i = 0; i < thp->compcount; i++) {
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      if (thp->components[i] == 0) {
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          if (thp->vst != 0)
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             break;
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          /* Video component.  */
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          st = av_new_stream(s, 0);
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          if (!st)
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             return AVERROR_NOMEM;
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          /* The denominator and numerator are switched because 1/fps
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             is required.  */
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          av_set_pts_info(st, 64, thp->fps.den, thp->fps.num);
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          st->codec->codec_type = CODEC_TYPE_VIDEO;
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          st->codec->codec_id = CODEC_ID_THP;
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          st->codec->codec_tag = 0;  /* no fourcc */
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          st->codec->width = get_be32(pb);
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          st->codec->height = get_be32(pb);
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          st->codec->sample_rate = av_q2d(thp->fps);
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          thp->vst = st;
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          thp->video_stream_index = st->index;
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          if (thp->version == 0x11000)
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             get_be32(pb); /* Unknown.  */
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        }
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      else if (thp->components[i] == 1) {
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          /* XXX: Required for audio playback.  */
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          thp->has_audio = 1;
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      }
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    }
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  return 0;
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}
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static int thp_read_packet(AVFormatContext *s,
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                            AVPacket *pkt)
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{
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    ThpDemuxContext *thp = s->priv_data;
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    ByteIOContext *pb = &s->pb;
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    int size;
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    int ret;
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    /* Terminate when last frame is reached.  */
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    if (thp->frame >= thp->framecnt)
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       return AVERROR_IO;
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    url_fseek(pb, thp->next_frame, SEEK_SET);
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    /* Locate the next frame and read out its size.  */
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    thp->next_frame += thp->next_framesz;
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    thp->next_framesz = get_be32(pb);
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                        get_be32(pb); /* Previous total size.  */
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    size              = get_be32(pb); /* Total size of this frame.  */
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    if (thp->has_audio)
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                        get_be32(pb); /* Audio size.  */
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    ret = av_get_packet(pb, pkt, size);
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    if (ret != size) {
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       av_free_packet(pkt);
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       return AVERROR_IO;
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    }
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    pkt->stream_index = thp->video_stream_index;
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    thp->frame++;
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    return 0;
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}
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AVInputFormat thp_demuxer = {
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    "thp",
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    "THP",
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    sizeof(ThpDemuxContext),
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    thp_probe,
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    thp_read_header,
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    thp_read_packet
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};